ratchet wheel

noun

a wheel, with teeth on the edge, into which a pawl drops or catches, as to prevent reversal of motion or convert reciprocating motion into rotatory motion.

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Origin:
1770–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Ratchet wheel is always a great word to know.

So is flibbertigibbet. Does it mean:

a fool or simpleton; ninny.

a chattering or flighty, light-headed person.

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WordNet

ratchet wheel
noun
toothed wheel held in place by a pawl or detent and turned by a lever

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